Authorities are bracing for mass celebrations if France -- a country still on high terrorist alert -- win today's final against Cristiano Ronaldo's Portugal.
Tricolour flags fly from apartment blocks and bars, cafes and parks are packed for showings of Les Bleus matches on giants screens.
"The French people needed to find their way again," Hollande said in a commentary on the wave of support for the national team that has been in disgrace in recent years.
The November 13 attacks across Paris left 130 dead. The Stade de France where France were playing Germany at the time was one of the sites targeted by suicide bombers along with the Bataclan concert hall and cafes that are now packed again.
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Hollande said French team playing in Sunday's final had been "very marked" by the attacks.
"The attacks were the same for them," he wrote.
"They want to give happiness. (Didier) Deschamps has given them this desire to make people happy. They know that this isn't just any ordinary moment in time," Hollande said.
On November 13, the suicide bombers did not get into the stadium but one person was killed -- a Portuguese man whose family has said there should be a tribute at Sunday's match.
The buildup to the tournament was dominated by fears that it could be a target for more attacks but also by weeks of strikes and protests over the government's bid to reform labour laws.
He admitted that reality would eventually crowd in even if France wins Sunday's final.
"Sport allows people to come together but politics divides people," he said.
"The Euro sweeps away everything else, it brings people together, but life will resume afterwards."
"I support the French team, I go to all their matches but I don't want to use sport for politics. That's not good for sport or for politics.